Operating under the business name Soothe Me Massage, Singh inappropriately touched 14 women during massages, when they were vulnerable and undressed.

Most of the massages had been purchased on the discount site GrabOne, where users can buy vouchers for a range of experiences.

E-commerce operations manager Melinda Hatton told Newshub that GrabOne conducted a series of checks when a new client became involved with the site.

"In order to advertise on the GrabOne platform, a merchant must complete an application process, including completing an account application, and discussing their products and services with a GrabOne account manager," she said.

"While the merchant is responsible for their own goods and services, GrabOne carries out certain checks against legal and regulatory requirements, which obviously vary depending on the product or service offered."

Ms Hatton said the site was currently undertaking a review of merchant on boarding processes and hoped to implement more thorough checks than those required by law.

She also said the site worked swiftly as soon as Singh's actions were uncovered.

"When we are alerted to an issue with the service provided by a merchant advertising through our platform, we always put the interests of GrabOne users first and act promptly to address any issues," she said.

"In this particular instance, we can confirm that GrabOne contacted purchasers who held unredeemed coupons for this merchant and offered full refunds.

"Refunds were also processed to victims who contacted GrabOne.

"GrabOne worked closely with victims and the NZ Police to provide any and all assistance possible."